Fairy Rings in Lawn: Fungal Nitrogen Release Creates Green Circles

Fairy rings are arcs of dark green grass caused by soil fungi decomposing organic matter and releasing nitrogen. Type 2 (green ring only) is harmless; Type 1 (dead ring) is harder to fix.

Management

• Light fertilizer over whole lawn masks the ring.
• Core aerate to disrupt fungal mat.
• Mushrooms after rain confirm fungal activity.
• In meadows, ignore—they’re natural.

Not magical—just microbiology.

Fairy ring—dark green circle from fungal nitrogen.

Grass detail in fairy ring.

Multiple rings in meadow.

Mushrooms appear after rain.